The luteal phase of the menstrual cycle is about the same length in most individuals (mean 14/13 days, SD 1.41 days) whereas the follicular phase tends to show much more variability (log-normally distributed with 95% of individuals having follicular phases between 10.3 and 16.3 days).he length of a woman's menstrual cycle typically varies somewhat, with some shorter cycles and some longer cycles. A woman who experiences variations of less than eight days between her longest cycles and shortest cycles is considered to have regular menstrual cycles.
Iambic pentameter is a commonly used type of metrical line in traditional English poetry and verse drama. The term describes the rhythm that the words establish in that line, which is measured in small groups of syllables called  feet . line of iambic pentameter is made up of five such pairs of short/long, or unstressed/stressed, syllables. Iambic rhythms come relatively naturally in English.
In a line of poetry, an iamb is a foot or beat consisting of an unstressed syllable followed by a stressed syllable, or a short syllable followed by a long syllable, according to free dictionary. An example is the word comPLETE. Iambic pentameter refers to a certain kind of line of poetry, and has to do with the number of syllables in the line and the emphasis placed on those syllables. Many of Shakespeare's works are often used as great examples of iambic pentameter.